EP 1051808 A1 20001115 - A CIRCUIT ARRANGEMENT FOR REDUCING INTERMODULATION IN A BANDPASS FILTER SYSTEM
Title (en)
A CIRCUIT ARRANGEMENT FOR REDUCING INTERMODULATION IN A BANDPASS FILTER SYSTEM
Title (de)
SCHALTUNGSANORDNUNG ZUM VERRINGERN VON INTERMODULATION IN EINER BANDFILTERANORDNUNG
Title (fr)
CIRCUIT PERMETTANT DE REDUIRE L'INTERMODULATION D'UN SYSTEME DE FILTRE PASSE-BANDE
Publication
Application
Priority
- US 9901013 W 19990119
- US 1275598 A 19980123
Abstract (en)
[origin: WO9938267A1] A circuit arrangement that reduces selected intermodulation. The circuit arrangement includes a signal amplifier coupled to a bandpass filter via an electrical path. Signal energy outside the passband is reflected back into the amplifier and causes intermodulation. The electrical path is constructed with a length that reduces intermodulation, where the length is an odd multiple of one-fourth the wavelength of a predetermined frequency in the passband. The length of the electrical path reduces intermodulation because certain signals reflected by the bandpass filter are approximately 180 DEG , or an odd multiple thereof, out of phase. Energy of problematic signals that are near the edge of the passband or in the stopband is reduced, such as third order intermodulation product and pairs of signals that produce third order intermodulation products.
IPC 1-7
IPC 8 full level
H01P 1/20 (2006.01); H03D 9/06 (2006.01); H04B 1/10 (2006.01)
CPC (source: EP US)
H01P 1/20 (2013.01 - EP US); H03D 9/06 (2013.01 - EP US); H04B 1/10 (2013.01 - EP US)
Designated contracting state (EPC)
DE FI GB
DOCDB simple family (publication)
WO 9938267 A1 19990729; AU 2324399 A 19990809; CN 1126275 C 20031029; CN 1289482 A 20010328; DE 69902144 D1 20020822; DE 69902144 T2 20030320; EP 1051808 A1 20001115; EP 1051808 B1 20020717; US 6072824 A 20000606
DOCDB simple family (application)
US 9901013 W 19990119; AU 2324399 A 19990119; CN 99802359 A 19990119; DE 69902144 T 19990119; EP 99903156 A 19990119; US 1275598 A 19980123